Tensile and shear strengths of bonded and rebonded orthodontic attachments

Jassem, H.A.; Retief, D.H.; Jamison, Homer C.

doi:10.1016/0002-9416(81)90358-4

Cited by 59 publications

(19 citation statements)

References 12 publications

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“…Despite the efforts to offer the proper chemical and mechanical methods for cleaning the provisional cement off the tooth surface, no definite protocol is in hand for cleaning the residual permanent cement from the dentin surface. The search for an efficient method of eliminating the adhesive resin cement after debonding of orthodontic bracket from the enamel surface has led to the introduction of a wide range of methods including manual removal techniques, scalers, composite polishing systems, tungsten carbide bur in high or low speed handpieces, ultrasonic instruments, and pumice paste 923282930313233. Moreover, air-powder abrasive systems have attempted to eliminate the residual adhesive from the enamel surface, which necessitates using rubber dam, mask, and eye protections 3435.…”

Section: Discussionmentioning

confidence: 99%

The effect of resin cement type and cleaning method on the shear bond strength of resin cements for recementing restorations

2017

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PURPOSEThis laboratory study assessed the effect of different dentin cleaning procedures on shear bond strength of resin cements for recementing prosthesis.MATERIALS AND METHODS4 × 4 flat surface was prepared on the labial surface of 52 maxillary central incisors. Metal frames (4 × 4 × 1.5 mm) were cast with nickel-chromium alloy. All specimens were randomly divided into 2 groups to be cemented with either Panavia F2.0 (P) or RelyX Ultimate (U) cement. The initial shear bond strength was recorded by Universal Testing Machine at a crosshead speed of 0.5 mm/min. Debonded specimens were randomly allocated into 2 subgroups (n = 13) according to the dentin cleaning procedures for recementation. The residual cement on bonded dentin surfaces was eliminated with either pumice slurry (p) or tungsten carbide bur (c). The restorations were rebonded with the same cement and were subjected to shear test. Data failed the normality test (P < .05), thus were analyzed with Mann Whitney U-test, Wilcoxon signed rank test, and two-way ANOVA after logarithmic transformation (α = .05).RESULTSThe initial shear bond strength of group P was significantly higher than group U (P = .001). Pc and Uc groups presented higher bond strength after recementation compared to the initial bond strength. However, it was significant only in Pc group (P = .034).CONCLUSIONThe specimens recemented with Panavia F2.0 provided higher bond strength than RelyX Ultimate cement. Moreover, a tungsten carbide bur was a more efficient method in removing the residual resin cement and increased the bond strength of Panavia F2.0 cement after recementation.

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Section: Discussionmentioning

confidence: 99%

The effect of resin cement type and cleaning method on the shear bond strength of resin cements for recementing restorations

2017

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“…These structures are very useful to increase the retention of resin composites for adhesion. [1][2][3][4] On the other hand, these structures are more vulnerable to acid attack. Acid etching does not improve crystalline structure and does not induce blocking of ion diffusion channels.…”

Section: Discussionmentioning

confidence: 99%

“…[1][2][3][4] Among the various proposed methods, etching with 37% phosphoric acid is the most widely used. As long as the enamel surface is clean and sustains enough etching to separate enamel crystallites, an optimal enamel-resin bond can be achieved.…”

Section: Introductionmentioning

confidence: 99%

Acid Resistance of Erbium-doped Yttrium Aluminum Garnet Laser–Treated and Phosphoric Acid–Etched Enamels

Kim¹,

Kwon

Kim

et al. 2006

The Angle Orthodontist

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Objective:To compare the effects of erbium-doped yttrium aluminum garnet (Er:YAG) laser ablation and of phosphoric acid etching on the in vitro acid resistance of bovine enamel. Materials and Methods: Teeth were polished to make the surface flat. The polished enamel was either etched with 37% phosphoric acid for 30 seconds or ablated with a single 33 J/cm 2 pulse from an Er:YAG laser. The control specimens were free from acid etching and laser ablation. Changes in crystal structure, dissolved mineral (calcium [Ca] and phosphorus [P]) contents, and calcium distribution in the enamel subsurface after a pH-cycling process were evaluated. Results: After laser treatment, poor crystal structures improved without forming any new phases, such as tricalcium phosphates. Among the tested enamels, dissolved mineral contents were significantly different (P Ͻ .05). Er:YAG laser-treated enamels had the lowest mineral dissolution (Ca, 13.78 ppm; P, 6.33 ppm), whereas phosphoric acid-etched enamels had the highest (Ca, 15.90 ppm; P, 7.33 ppm). The reduction rate and reduced depth of calcium content along the subsurface were lowest in Er:YAG laser-treated enamels. Conclusion:The Er:YAG laser-treated enamels are more acid resistant to acid attack than phosphoric acid-etched enamels.

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“…The literature provides inconsistent findings regarding the shear bond strength of rebonded brackets with some reporting lower bond strength while others report comparable or higher bond strength. [12][13][14][15][16] Researchers stress the importance of clinical studies because of the inherent limitations of the laboratory studies. [17][18][19][20] The hypothesis of this study was that with repeated bonding, the bond strength, the adhesive remnant index scores (ARI), and the failure sites of adhesive systems, two self-etch primers and a phosphoric acid etch would show no significant differences for bonding orthodontic brackets.…”

Section: Introductionmentioning

confidence: 99%

Rebonding of Orthodontic Brackets

Montasser

Drummond

Evans

2008

The Angle Orthodontist

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Objective: To compare rebonding of orthodontic brackets based on the hypothesis that no difference would be found between the adhesive systems with respect to shear bond strength, mode of failure, and clinical failure rates. Materials and Methods: The three adhesive systems included two self-etch primers (Transbond and M-Bond) and a conventional phosphoric acid etch (Rely-a-Bond). The sample size was 20 premolars for each adhesive system. The shear bond strength was tested 24 hours after bracket bonding with the bonding/debonding procedures repeated two times after the first debonding. Bond strength, adhesive remnant index (ARI), and failure sites were evaluated for each debonding. Statistical analysis consisted of a two-way analysis of variance (ANOVA) followed by Scheffè analysis. The clinical portion evaluated 15 patients over a 12-month period. Results: The mean shear bond strengths after the first, second, and third debondings for Relya-Bond were 8.4 Ϯ 1.8, 10.3 Ϯ 2.4, and 14.1 Ϯ 3.3 MPa, respectively; for Transbond 11.1 Ϯ 4.6, 13.6 Ϯ 4.5, and 12.9 Ϯ 4.4 MPa, respectively; and for M-Bond 8.7 Ϯ 2.7, 10.4 Ϯ 2.4, and 12.4 Ϯ 3.4 MPa, respectively. After the three debondings the mean shear bond strength increased significantly from the first to the third debonding for Rely-a-Bond and M-bond (P Յ .001), but did not change for Transbond (P ϭ .199). Conclusions:The original hypothesis is not rejected. The two self-etching primers showing higher or comparable bond strength to the conventional phosphoric etch with less adhesive remnant on the enamel surface after the first debonding. With repeated bonding/debonding, the differences in the bond strength, ARI, and failure site were not significantly different. There was no difference in the clinical performance of the three adhesive systems (P ϭ .667).

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Tensile and shear strengths of bonded and rebonded orthodontic attachments

Cited by 59 publications

References 12 publications

The effect of resin cement type and cleaning method on the shear bond strength of resin cements for recementing restorations

The effect of resin cement type and cleaning method on the shear bond strength of resin cements for recementing restorations

Acid Resistance of Erbium-doped Yttrium Aluminum Garnet Laser–Treated and Phosphoric Acid–Etched Enamels

Rebonding of Orthodontic Brackets

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